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Symbols and Polyatomic Ions Quiz

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Questions and Answers

What is the correct formula for magnesium chloride?

MgCl2 (correct)

Mg2Cl

MgCl3

MgCl

In writing chemical formulas, why do we criss-cross the charges of combining atoms?

To indicate the type of bond

To balance the valencies

To balance the charges (correct)

To make the compound neutral

What is the formula for sodium nitrate?

NaNO3 (correct)

NaNO2

NaN2O3

Na2NO3

Why do we use brackets in chemical formulas?

To group polyatomic ions Signup and view all the answers

What would be the formula for calcium oxide?

CaO Signup and view all the answers

Which of the following is NOT a correct chemical formula?

(H)4S Signup and view all the answers

Why is the formula for calcium hydroxide written as Ca(OH)2 and not CaOH2?

To indicate individual hydroxyl groups Signup and view all the answers

What is the correct formula for aluminum oxide?

(Al)2O3 Signup and view all the answers

If the valencies of two elements are different, how would you determine the formula of their compound?

<h1>of atoms and their valencies</h1> Signup and view all the answers

What could be the formula for hydrogen chloride if it followed the rules of criss-crossing valencies?

HCl Signup and view all the answers